Apparatus and methods for computerized object identification

ABSTRACT

Apparatus and methods for identification of a coded pattern visible to a computerized imaging apparatus while invisible or inconspicuous to human eyes. A pattern and/or marking may serve to indicate identity of an object, and/or the relative position of the pattern to a viewer. While some solutions exist for identifying patterns (for example, QR codes), they may be visually obtrusive to a human observer due to visual clutter. In exemplary implementations, apparatus and methods are capable of generating patterns with sufficient structure to be used for either discrimination or some aspect of localization, while incorporating spectral properties that are more aesthetically acceptable such as being: a) imperceptible or subtle to the human observer and/or b) aligned to an existing acceptable visual form, such as a logo. In one variant, a viewer comprises an imaging system comprised as a processor and laser scanner, or camera, or moving photodiode.

PRIORITY

This application claims priority to U.S. Provisional Patent ApplicationSer. No. 62/068,166, filed on Oct. 24, 2014, entitled “APPARATUS ANDMETHODS FOR COMPUTERIZED OBJECT IDENTIFICATION”, which is incorporatedherein by reference in its entirety.

COPYRIGHT

A portion of the disclosure of this patent document contains materialthat is subject to copyright protection. The copyright owner has noobjection to the facsimile reproduction by anyone of the patent documentor the patent disclosure, as it appears in the Patent and TrademarkOffice patent files or records, but otherwise reserves all copyrightrights whatsoever.

BACKGROUND

Technological Field

The present disclosure relates to computer vision and identification ofobjects by robotic devices.

Background

Object detection and/or identification may be utilized in a variety ofapplications such as navigation, surveillance, retail, agriculture,public event infrastructure, and or other applications. While somesolutions may exist for the identity of patterns (e.g., QR code) theymay be often visually glaring and/or offensive to people because theyadd visual clutter to a scene, and/or reveal objects being markedthereby potentially exposing presence of a security and/or itsoperational characteristics. Here we propose methods and apparatus mayprovide for less visible means for marking and/or identifying objects byrobotic devices.

SUMMARY

A method of detecting an object by a computerized imaging apparatus isdisclosed. In one embodiment, the method comprise: observing an object,wherein the object comprises a pattern; sensing at least a portion ofthe pattern on the object; and identifying the object based on thesensed at least portion of the pattern; wherein the pattern comprises atleast one medium that is undetectable via wavelengths that are visibleto a human eye but detectable by the computerized imaging apparatus.

In one variant, sensing the pattern comprises sensing a first mediumthat is absorbent at a given wavelength range outside a givenhuman-visible spectral range, and a second medium that is less absorbentin the given spectral range relative to the first medium. In a secondvariant, the first medium and the second medium comprise fiber threadswoven into a textile of the object. In a third variant, the first mediumand the second medium comprise material that was printed onto the objectby a 3-D printing process.

In some cases, sensing the pattern comprises sensing a spectrum ofmetameric coloration.

In other cases, sensing the pattern comprises sensing a polarizedcomposition of reflected light. For example, in one such case,responsive to an electro-optical device changing a composition of thepolarized composition of reflected light, identifying the changedcomposition of the polarized reflected light.

In still other embodiments, sensing the pattern on the object comprisessensing a given wavelength range that comprises an infrared or anultraviolet portion.

An article of manufacture is disclosed. In one embodiment, the articleof manufacture includes: a first thread type characterized by a firstoptical property and a second thread type characterized by a secondoptical property, the threads of the first type and the second typecombined into a pattern on a textile fabric forming at least a portionof the article of manufacture. In one such exemplary embodiment, thefirst optical property and the second optical property areindistinguishable by a human eye; and the first optical property and thesecond optical property are selected to be distinguishable by an imagingsensor.

In one variant, the first optical property is distinguishable from thesecond optical property by the imaging sensor based on one or more oflight reflectance, wavelength, or polarization.

In a second variant, the pattern comprises one or more geometric shapes.

In a third variant, the pattern further comprises a portion that isvisible to the human eye.

A method of tracking a person by a robotic apparatus is disclosed. Inone embodiment, the method includes: acquiring a representation of theperson at a distance; identifying a characteristic of a pattern disposedon the representation of the person; and adjusting a trajectory of theapparatus so as to maintain a range to the person within a target range.In one exemplary embodiment, the method further includes: detecting asignal at a wavelength invisible to a human; and the pattern comprisesone or more elements that are configured to reflect the signal at thewavelength.

In one variant, the signal comprises light reflected from a garment ofthe human.

In a second variant, the signal comprises light generated from a specialilluminant.

In a third variant, the method includes identifying the characteristiccomprises identifying one or more geometric shapes of the pattern.

A system configured to detect an object is disclosed. In one embodiment,the system includes: a data structure that associates at least theobject with a marking in a first spectral range that is unobservable bya human eye; a computerized imaging apparatus comprising a detectorconfigured to receive one or more spectral components, the detectorcomprising a filter configured to block or reduce a second spectralrange that is in a visible portion of the spectrum, the second spectralrange being in one or more polarizations; and responsive to receiving aspectral component in the first spectral range, the computer imagingapparatus is configured to identify the object.

In one variant, the computerized imaging apparatus further comprises anilluminant configured to generate light that comprises at least thefirst spectral range.

In a second variant, the computerized imaging apparatus furthercomprises a fixture configured to mark the object with the marking.

In a third variant, the computerized imaging apparatus is furtherconfigured to detect changes in the marking.

These and other objects, features, and characteristics of the presentinvention, as well as the methods of operation and functions of therelated elements of structure and the combination of parts and economiesof manufacture, will become more apparent upon consideration of thefollowing description and the appended claims with reference to theaccompanying drawings, all of which form a part of this specification,wherein like reference numerals designate corresponding parts in thevarious figures. It is to be expressly understood, however, that thedrawings are for the purpose of illustration and description only andare not intended as a definition of the limits of the invention. As usedin the specification and in the claims, the singular form of “a”, “an”,and “the” include plural referents unless the context clearly dictatesotherwise.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a graphical illustration depicting viewing of a pattern on asurface by a human eye, according to one or more implementations.

FIG. 1B is a graphical illustration depicting viewing of a pattern on asurface by an imaging apparatus, according to one or moreimplementations.

FIG. 2 is a block diagram illustrating an imaging sensor comprising alens and a selective filter directed at an object surface that containsa code, according to one or more implementations.

FIG. 3 is a graphical illustration depicting an imaging sensor with alens and filter that is directed at an article of clothing with a codeembedded into the fabric, in accordance with one or moreimplementations.

FIG. 4A is a graphical illustration depicting an exemplary item ofclothing comprising a pattern of rectangles that is visually unobtrusivewhile machine detectable, in accordance with one or moreimplementations.

FIG. 4B is a graphical illustration depicting an exemplary item ofclothing comprising a pattern of fractals that is visually unobtrusivewhile machine detectable, in accordance with one or moreimplementations.

FIG. 4C is a graphical illustration depicting an exemplary item ofclothing comprising a pattern of circles that is visually unobtrusivewhile machine detectable, in accordance with one or moreimplementations.

FIG. 5 is a plot depicting distance distribution of pattern elements of,e.g., patterns of FIG. 4A, in accordance with one or moreimplementations.

FIG. 6A is a functional block diagram illustrating components of acomputerized apparatus configured for use with one or moreimplementations disclosed herein.

FIG. 6B is a functional block diagram illustrating components of acomputerized imaging system configured to detect human non-detectiblecodes, in accordance with one or more implementations.

FIG. 7 is a graphical illustration depicting determination of vehiclerelative position by an imaging sensor capable of detecting machinedetectable code on a surface of vehicle, according to one or moreimplementations.

FIG. 8 is a graphical illustration depicting a downward facing imagingapparatus configured to facilitate vehicle navigation, according to oneor more implementations.

FIG. 9A is a graphical illustration depicting an imaging apparatusdisposed on a cart and configured to enable cart navigation by trackingan invisible code disposed on a person, in accordance with one or moreimplementations.

FIG. 9B is a graphical illustration depicting a system including aceiling-mounted imaging apparatus configured to image an indoorenvironment and detecting a code on a person and/or objects, inaccordance with one or more implementations.

FIG. 10A is a graphical illustration depicting application of anidentification material onto a plant for detection by a computerizedimaging apparatus, in accordance with one or more implementations.

FIG. 10B is a graphical illustration depicting appearance to a humanobserver of an unmarked plant and a plant marked with an invisible codeapplied thereon, in accordance with one or more implementations.

FIG. 10C is an image illustrating detection by a computerized imagingapparatus of a plant marked with an invisible code, in accordance withone or more implementations.

FIG. 11 is a logical flow diagram illustrating a method of usinginvisible coding for triggering an action based on identification of thecode, in accordance with one or more implementations.

FIG. 12 is a logical flow diagram illustrating a method of patternadjustment for use with the computer detectable pattern methodology, inaccordance with one or more implementations.

FIG. 13 is a logical flow diagram illustrating a method of detecting apattern in an image for use with the computer detectable patternmethodology, in accordance with one or more implementations.

FIG. 14A is a graphical illustration depicting application of anexpression agent to a living plant to enable subsequent identificationby a computerized imaging apparatus, in accordance with one or moreimplementations.

FIG. 14B is a graphical illustration depicting absorption of the agentby the plant and expression of a characteristic by the plant, inaccordance with one or more implementations.

FIG. 14C is a graphical illustration depicting appearance to a humanobserver of an unmarked plant and a plant with expressed characteristic,in accordance with one or more implementations.

FIG. 14D is graphical illustration depicting detection by a computerizedimaging apparatus of the expressed characteristic of the plant, inaccordance with one or more implementations.

FIG. 15 is block diagram depicting detection of a pattern in an imagefor use with various implementations of computer detectable patternmethodology, in accordance with one or more implementations.

All Figures disclosed herein are © Copyright 2015 Brain Corporation. Allrights reserved.

DETAILED DESCRIPTION

Implementations of the present technology will now be described indetail with reference to the drawings, which are provided asillustrative examples so as to enable those skilled in the art topractice the technology. Notably, the figures and examples below are notmeant to limit the scope of the present disclosure to a singleimplementation or implementation, but other implementations andimplementations are possible by way of interchange of or combinationwith some or all of the described or illustrated elements. Whereverconvenient, the same reference numbers will be used throughout thedrawings to refer to same or like parts.

Where certain elements of these implementations can be partially orfully implemented using known components, only those portions of suchknown components that are necessary for an understanding of the presentinvention will be described, and detailed descriptions of other portionsof such known components will be omitted so as not to obscure thedisclosure.

In the present specification, an implementation showing a singularcomponent should not be considered limiting; rather, the invention isintended to encompass other implementations including a plurality of thesame component, and vice-versa, unless explicitly stated otherwiseherein.

Further, the present disclosure encompasses present and future knownequivalents to the components referred to herein by way of illustration.

As used herein, the term “bus” is meant generally to denote all types ofinterconnection or communication architecture that is used to access thesynaptic and neuron memory. The “bus” may be optical, wireless,infrared, and/or another type of communication medium. The exacttopology of the bus could be for example standard “bus”, hierarchicalbus, network-on-chip, address-event-representation (AER) connection,and/or other type of communication topology used for accessing, e.g.,different memories in pulse-based system.

As used herein, the term “camera” refers without limitation or estoppelto any imaging device or sensor configured to capture, record, and/orconvey still and/or video imagery, which may be sensitive to visibleparts of the electromagnetic spectrum and/or invisible parts of theelectromagnetic spectrum (e.g., infrared, ultraviolet, and/or otherwavelengths that are not perceptible to humans).

As used herein, the terms “computer”, “computing device”, and“computerized device” may include one or more of personal computers(PCs) and/or minicomputers (e.g., desktop, laptop, and/or other PCs),mainframe computers, workstations, servers, personal digital assistants(PDAs), handheld computers, embedded computers, programmable logicdevices, personal communicators, tablet computers, portable navigationaids, J2ME equipped devices, cellular telephones, smart phones, personalintegrated communication and/or entertainment devices, and/or any otherdevice capable of executing a set of instructions and processing anincoming data signal.

As used herein, the term “computer program” or “software” may includeany sequence of human and/or machine cognizable steps which perform afunction. Such program may be rendered in a programming language and/orenvironment including one or more of C/C++, C#, Fortran, COBOL, MATLAB™,PASCAL, Python, assembly language, markup languages (e.g., HTML, SGML,XML, VoXML), object-oriented environments (e.g., Common Object RequestBroker Architecture (CORBA)), Java™ (e.g., J2ME, Java Beans), BinaryRuntime Environment (e.g., BREW), and/or other programming languagesand/or environments.

As used herein, the terms “connection”, “link”, “transmission channel”,“delay line”, “wireless” may include a causal link between any two ormore entities (whether physical or logical/virtual), which may enableinformation exchange between the entities.

As used herein, the term “memory” may include an integrated circuitand/or other storage device adapted for storing digital data. By way ofnon-limiting example, memory may include one or more of ROM, PROM,EEPROM, DRAM, Mobile DRAM, SDRAM, DDR/2 SDRAM, EDO/FPMS, RLDRAM, SRAM,“flash” memory (e.g., NAND/NOR), memristor memory, PSRAM, and/or othertypes of memory.

As used herein, the terms “integrated circuit”, “chip”, and “IC” aremeant to refer to an electronic circuit manufactured by the patterneddiffusion of trace elements into the surface of a thin substrate ofsemiconductor material. By way of non-limiting example, integratedcircuits may include field programmable gate arrays (e.g., FPGAs), aprogrammable logic device (PLD), reconfigurable computer fabrics (RCFs),application-specific integrated circuits (ASICs), and/or other types ofintegrated circuits.

As used herein, the terms “microprocessor” and “digital processor” aremeant generally to include digital processing devices. By way ofnon-limiting example, digital processing devices may include one or moreof digital signal processors (DSPs), reduced instruction set computers(RISC), general-purpose (CISC) processors, microprocessors, gate arrays(e.g., field programmable gate arrays (FPGAs)), PLDs, reconfigurablecomputer fabrics (RCFs), array processors, secure microprocessors,application-specific integrated circuits (ASICs), and/or other digitalprocessing devices. Such digital processors may be contained on a singleunitary IC die, or distributed across multiple components.

As used herein, the term “network interface” refers to any signal, data,and/or software interface with a component, network, and/or process. Byway of non-limiting example, a network interface may include one or moreof FireWire (e.g., FW400, FW800, etc.), USB (e.g., USB2), Ethernet(e.g., 10/100, 10/100/1000 (Gigabit Ethernet), 10-Gig-E, etc.), MoCA,Coaxsys (e.g., TVnet™), radio frequency tuner (e.g., in-band or OOB,cable modem, etc.), Wi-Fi (802.11), WiMAX (802.16), PAN (e.g., 802.15),cellular (e.g., 3G, LTE/LTE-A/TD-LTE, GSM, etc.), IrDA families, and/orother network interfaces.

As used herein, the term “paint” refers without limitation or estoppelto one or more pigment(s), dye(s), colorant(s), film(s), layer(s),and/or any other medium, material, and/or element that altersabsorption, transmission, refraction, and/or reflection ofelectromagnetic radiation when placed, sprayed, deposited, mixed,dissolved, added, applied, and/or otherwise disposed on or integratedwith a material surface.

As used herein, the term “robot” refers without limitation or estoppelto an device, vehicle, computer, AI agent, surveillance system ordevice, control system or device, and/or other computerized devicecapable of autonomous, semi-autonomous, or controlled operation.

As used herein, the term “Wi-Fi” includes one or more of IEEE-Std.802.11, variants of IEEE-Std. 802.11, standards related to IEEE-Std.802.11 (e.g., 802.11 a/b/g/n/s/v), and/or other wireless standards.

As used herein, the term “wireless” means any wireless signal, data,communication, and/or other wireless interface. By way of non-limitingexample, a wireless interface may include one or more of Wi-Fi,Bluetooth, 3G (3GPP/3GPP2), HSDPA/HSUPA, TDMA, CDMA (e.g., IS-95A,WCDMA, etc.), FHSS, DSSS, GSM, PAN/802.15, WiMAX (802.16), 802.20,narrowband/FDMA, OFDM, PCS/DCS, LTE/LTE-A/TD-LTE, analog cellular, CDPD,satellite systems, millimeter wave or microwave systems, acoustic,infrared (i.e., IrDA), and/or other wireless interfaces.

A pattern and/or demarcation may be applied to indicate the identity ofan object and/or surface, and/or their relative position of the patternto a viewer. A viewer may be an imaging system comprising a processor incommunication with one or more of a laser scanner, a camera, a movingphotodiode, and/or other components. While some solutions may exist foridentifying patterns (e.g., QR code) they may be often visually glaringand may be offensive to people because they add visual clutter to ascene. Exemplary implementations include methods capable of generatingpatterns with one or both of: (1) sufficient structure to be used foreither discrimination, or some aspect of localization, and/or (2)spectral properties that are more aesthetically acceptable (e.g.,imperceptible or subtle to the human observer and/or aligned to anexisting acceptable visual form, such as a logo).

In some implementations, methods of generating spectral patterns thatmay not be detectable by humans (and/or appear subtle to humans) aredisclosed.

In some implementations, active targets may be provided usingelectro-sensitive films or liquid crystal films to change any of theactive target's aforementioned optic properties dynamically. In somevariants, active targets can display different information according totheir input signals (similar to the manner in which an LCD displayoperates). Certain implementations may be optimized for thinness,flexibility, and/or degree of perceptibility with the human eye).

One or more implementations disclosed herein may work in daylight orartificial light, and may not require a special illuminant. Someimplementations may involve special-illuminant approaches such asfluorescence targets, x-ray absorption targets, and/or other approaches.In some implementations, targets may be configured for use withpolarized light. By way of an illustration, quarter wave plates for agiven visible wavelength may become apparent in polarized light.

In some variants, a quick response (QR) code may be utilized with themethodology described herein. In some implementations, the QR code maybe configured based on a modification of light polarization that may bereflected from the surface of the code area. For example, a knownpattern may be utilized (e.g., a checkerboard patch and/or one or moresquare bull's eyes) that are specifically designed to aid in QR codedetection, alignment, and recognition of encoding standard.

In some implementations, various methods may be employed for patterndetection, e.g., optical tracking and alignment, blob tracking,de-warping, similarity maximization, and/or other methods. In one ormore implementations of machine learning, one or more of unsupervisedmachine learning (clustering, greedy feature extraction, recurrentnetworks) and/or supervised machine learning (multilayer perceptron,working memory, nearest neighbor classifier) algorithms may be employed.

In one or more implementations, an ultraviolet (UV) absorbent paint maybe used for identifying a target using a transmitted-light. The termtarget may be used to describe a QR code, a bull's-eye pattern, an itemidentification (ID), e.g., a serial number, a pennant number, and/orother characteristic.

A substance transparent to the visible light but absorbing near-UV lightmay form a good transmission target when a volume-applied,layer-applied, and/or surface-applied treatment of the substance isdisposed on a transparent material such as glass, acrylic,polycarbonate, polyethylene, mica, and/or other transparent material.

In one or more implementations, an UV absorbent material may be used foridentifying a target using reflected-light. A substance highlyreflective to the visible light (e.g., white) but absorbing near-UVlight may form a high contrast reflection target when applied. Atransmitted-light target may be converted to a reflected-light targetwhen a reflective layer is placed under it.

In some implementations, a combination of absorption and thin-filmtarget approaches may be utilized. For example, a layer scatteringvisible light and absorbing UV may be over imposed on a layer thatselectively reflects UV light at certain wavelengths.

In one or more implementations, a 3D printed object may be composed oftwo plastics that appear to be the same color, but have differingabsorbance outside the visible spectrum (e.g., one absorbs UV light, andthe other reflects it.) The deposition of the plastics into solid formsmay be in accordance with a digitally defined policy that allows thesurface marking to display a 2D pattern.

In one or more implementations, surface reflectance properties of anobject may be used for embedding a code. For example, this may be donewith a coating, by changing the material itself, by texturizing thematerial (e.g., glossy vs matte), and/or other approaches.

In some implementations, threads of fabric or composite (e.g., anin-weave in carbon fiber) may be dyed (e.g., UV absorptive) and/orcoated (e.g., changing the diffraction of incident light) with apigment, polymer, and/or paint. The combination of two or more differentthreads, or a treated thread upon an untreated background fabric, e.g.,utilizing a Jacquard weaving technique or similar method, may allow forthe creation of a 2D pattern prior to, during, and/or after themanufacturing of clothing, rugs, sheets, carpets, upholstery, and/orother fabrics. In one implementation, a series of circular dots arearranged on a hexagonal grid, such that the spacing between each dot isa fixed distance, allowing an external imaging system to more accuratelyassess the distance to the proximal surface of the object.

An imaging apparatus outfitted with an appropriately polarized filtermay be used to detect the pattern. Other physical patterns may be usedfor augmented reality, unique identification, back projection, and/orother applications.

In one or more implementations, dichroic filters and/or thin-film opticsmay be utilized for target identification. By way of an illustration, athin-layered target will reflect and transmit different wavelengthsdifferently.

In some implementations, a pressurized spray container and/or otherspraying device may deposit a substance (e.g., UV absorptive or UVreflective pigment) in a predetermined pattern (e.g., with theassistance of a stencil). The pigment may be invisible to the human eye,and thus may coat any surface to achieve the desired demarcation in thenon-visual spectrum. In some implementations, two or more spraycontainers may be metameric and/or nearly metameric (i.e., both appearto be the same or similar to the human eye, e.g., RED 1 and RED 2). Thecontainers may activate the same ratio of cone cells (S, M, and L)during transduction, but the albedo of natural light may differ,providing a signature between the two different reds, accessible by theright spectral filter. Such a filter may be designed or selected suchthat it discriminates between the two reds. Those skilled in the artwill appreciate that the spectral absorption and reflection propertiesof the two sprayed substances (e.g., paints, pigments, dyes, and/orcoatings) may be chosen so that they would look the same to the humaneye under one light source but not under another (e.g., sunlight vs.tungsten light); and/or that the intensity of reflection from the twopaints would inform a robot as to the ambient lighting conditions.

In some implementations, a water-insoluble marker (e.g., a chalk) and/ora water-soluble marker (e.g., a fertilizer) may be deposited on theground. Fertilizer or other water-soluble substances may be taken up bythe plants, selectively (by some plants) or non-selectively (by allplants in the treated area), altering their optical properties outsidethe human visible range and making them look different to a robot (e.g.,for weeding or other agricultural purposes). A chalk, paint, spray,and/or other material may be used to mark plants, plant parts, and/orplant locations (e.g., mark the ground next to the plant) so that thedifference between the marked and unmarked plants would be clearlyvisible to a robot, but invisible or inconspicuous to the human eye. Insome implementations, special care may be taken to ensure that thematerials used comply with organic and/or other specifications pertinentto the commercial and/or other plant growing procedures. In someimplementations, special care may be taken to ensure that the materialsused do not interfere in undesired manner with the vital processes ofthe plants and/or other organisms in the vicinity.

In some implementations, an organism (e.g., a plant, animal, and/orother organism) may be genetically and/or epigenetically modified toexpress and/or to suppress expression of novel, modified, and/orunmodified substance (e.g., pigment, opsin, and/or other substance) sothat the entire organism and/or some parts thereof would appeardifferent to a robot (e.g., outside the visible spectrum) yet similar oridentical to a human eye, compared to an unmodified organism.

In some implementations, a silk screen, laser print, ink jet print,lithographic process, and/or other technique for applying material tosurfaces may result in the generation of the desired patterned marking.

In some implementations, the electrical signal of a rasterized scan(e.g., for a CRT, LCD, LED. liquid crystal, eInk, mirasol, DLP, and/orother display technology), may result in the activation of pixels withspectral emissions that are the same in the visible range, but differoutside of the visible range.

Those skilled in the art will appreciate that the effects describedabove may be achieved not only by means of dyes or pigments that alterabsorption and/or transmission and/or reflection of light, but also by(but not limited to) one or more of the following means: (1) thin-film,dichroic, interference, birefringent, and/or other linear or nonlinearoptical components and/or coatings; (2) surfaces, coatings, and/orelements (e.g., quarter-wave plates) that may alter polarization of thetransmitted and/or reflected light; (3) liquid-crystal devices; and/or(4) other means (e.g., electro- or chemo-sensitive) that may changetheir properties according to an external signal and/or ambientconditions, so that the invisible and/or inconspicuous pattern maychange dynamically according to external input and/or ambientconditions.

Those skilled in the art will appreciate that additional information maybe extracted from the optical properties of such markings outside thevisible spectrum. For example, angle of view may be determined from thecutoff wavelength of a dichroic filter.

Various patterns may be utilized with the object tagging methodologydescribed herein. Non-limiting examples of such patterns may includepatterns of one or more of dots, stripes, squares, polygons, fractalpatterns, barcodes and/or other algorithmically generated code andidentification systems, combinations of patterns reflecting visiblelight and invisible electromagnetic waves, visible pattern and invisiblemetadata, invisible detection points, visible pattern identity, and/orother patterns.

In some implementations, pattern detection may include one or more of:(1) detection of a code (e.g., orange lump with some invisible spectralvariation), (2) identification of features (e.g., location of circlecenters in image plane), (3) processing of feature relationships (e.g.,distances between particular points), (4) extraction of knowledge(identity of marker, depth, orientation or location), and/or otheractions.

In some implementations, the following approaches may be employed forproviding invisible and/or nearly imperceptible machine detectablepatterns: (1) the use of polarized light; (2) the use of color metamers(e.g., colors which are substantially identical within the visiblespectra of wavelength (human cone cells activate in substantially thesame manner for a color and its metamers), but incorporate additionalspectral components that are invisible or very subtle to humans); (3)the use of colors that are “close” in human perception, but very easyfor a matching spectral notch filter to discriminate; (4) the use ofdifferent reflectance properties (e.g., glossy black vs matte black thatis easy to detect with any reflected back projection, or infrared flash,but which may be subtle to the human eye); (5) the use of differenceimages for two different filtered cameras that can isolate theparticular tags, and cancel out other patterns (e.g., useful in highsignal to noise applications, based on the filter); and/or otherapproaches.

In some implementations, specific parameters of spectral energy emissionmay be used to provide the invisible codes.

In one or more implementations, the methodology described herein may beutilized for one or more of: (1) Tracking a marked object, (2)Identifying a marked object or class of marked objects, (3)Distinguishing between differently marked objects, (4) Keeping constantdistance from a marked object, (5) Providing a teaching stimulus to arobot, (6) Providing object-related information to a robot, (7)Providing navigational information to a robot, (8) Providing a commandto a robot (e.g., by changing, exposing, or obscuring the pattern), (9)Triggering an action or camera when a particular pattern or object isseen, (10) Triggering an action or camera when a particular pattern orobject is seen in a particular range of parameters (e.g., distance,viewing angle, speed of motion, ambient conditions, and/or otherparameters), and/or other applications.

FIG. 1A illustrates an example of a simple pattern 102 on a surface 110.The pattern 102 may comprise markings that may not be visible to a humaneye 100. The pattern 102 may be an optically invisible marker (e.g.,dyed), part of an aesthetic visual form on the surface 110, a pigmentthat is metameric with the surface, etc., as described supra.

Such a pattern may be distinguished by a non-human viewer. FIG. 1Billustrates detection of the pattern of FIG. 1A by an imaging sensor 150characterized by a sensitivity enabling the sensor to detect theinvisible markings (i.e., marking not visible to the human eye). Thepattern 152 is observable by the sensor 150 and may be used as an inputfor further processing. Additionally shown is a fronto-parallel planethat may comprise a plane perpendicular to an axis that is normal to theplane of the pattern (e.g., the axis denoted by arrow 154 in FIG. 1Bthat may be perpendicular to the plane 160).

FIG. 2 illustrates another example of a distinguishable patterndetectable by a machine or apparatus 200, where an imaging sensor 202comprising a lens 204 and a selective filter 206 directed at an objectsurface 220 that contains a code 222, according to one or moreimplementations. In one implementation, similar to the pattern shown inFIGS. 1A and 1B, the sensor 200 may be configured to detect the code 222that otherwise may be invisible to humans. The code may be an adhesive,additive paint, and/or printed into the material of the object itself.Other structures, materials and/or mechanisms as described supra may beused exploit the different perceptive capabilities between a humanobserver and a machine sensor able to distinguish visual or spectralcharacteristics of the code 222.

FIG. 3 illustrates still another example of a machine observer 300,where an imaging sensor 302 comprising a lens 304 and filter 306 isdirected at an article of clothing 310 with a code 312 embedded into thefabric, in accordance with one or more implementations. In oneimplementation, the code 312 comprises shapes recognizable by themachine 300 (e.g., triangles, rectangles, circles, etc.), and maycomprise a sprayed pigmented dye, printed coating, or other substancewith a particular absorptive or reflective property. Such a code may berecognizable by the machine observer under an appropriate light source(e.g., UV). Filter 306 may be a spectral filter that may or may not benecessary to for the sensor 302 to recognize the code 312, by virtue ofspectral absorption and reflective properties of the filter 306 and/orthe material of code 312, as described supra. Elsewhere on the fabricmay be a logo or other visible feature 314, where the code 312 may beembedded thereon or implemented so as to be unnoticeable and visuallyunobtrusive to a human observer.

FIG. 4A is a graphical illustration depicting an item of clothing 430comprising a pattern 432 that is visually unobtrusive while machinedetectable, comprising a plurality of rectangles 446 disposed at aplurality of distances 448 from one another, in accordance with one ormore implementations. In one implementation, a machine-detected view ofthe clothing 440 shows rectangles arranged among blank areas 442, 444.The pattern of rectangles 446, the presence of rectangles, and/or thedistances 448 of rectangles may indicate an encoded pattern or signalfor the machine detecting the pattern. Other shapes or polygons, e.g.,circles (as in FIG. 4C) or triangles, in lieu of rectangles may berecognized by the machine. Such shapes may be formed individually or ina grouped manner, and by various means (e.g., coated, stenciled, dyed)as described supra, and may (to varying degrees and/or camouflaged withother visible features) or may not be perceptible to human observers.Certain spectral properties of material used to form the shapes (e.g.,rectangles 446) may be taken advantage of in order to use varioussurfaces of the clothing 430. For example, shapes formed on both thefront and the back may be detected using material that are relativelytransparent. That is, material that absorbs and/or reflects non-visiblelight (e.g., infrared (IR), UV) may be detectable even though it is notin direct line of sight by a machine sensor.

FIG. 4B is a graphical illustration depicting an item of clothing 460comprising a pattern that is visually unobtrusive while machinedetectable, comprising a fractal pattern 402, in accordance with one ormore implementations. In one implementation, a machine-detected view ofthe clothing 470 shows the fractal pattern visible to a machine sensorwith distinct areas 472, 474 clearly distinguishable. The pattern todetect may comprise size, fractal level, location, presence, etc., ofareas 472, 474. In another implementation, the detectable pattern may bethe fractal properties of darkened areas (i.e., other than areas 472,474). Such a pattern may be formed by various means (e.g., coated,stenciled, dyed) as described supra, and may or may not (to varyingdegrees and/or camouflaged with other visible features) be perceptibleto human observers.

FIG. 4C is a graphical illustration depicting an item of clothing 480comprising pattern that is visually unobtrusive while machinedetectable, comprising circles 482 disposed at a plurality of distances494 from one another, in accordance with one or more implementations. Inone implementation, a machine-detected view of the clothing 490 shows aplurality of circles 492 arranged in a pattern. Distances 494 may varyor be constant for some or all of the circles 492. Such shapes andpatterns may be formed individually or in a grouped manner, and byvarious means (e.g., coated, stenciled, dyed) as described supra, andmay or may not (to varying degrees and/or camouflaged with other visiblefeatures) be perceptible to human observers.

FIG. 5 is a plot 500 depicting distance distribution of pattern elementsof, e.g., patterns of FIG. 4B or 4C, in accordance with one or moreimplementations. For example, based on a horizontal or vertical sum ofareas 472, 474 in FIG. 4B, a histogram 500 of distance (e.g., from oneside of the pattern to the opposite side) plotted against area may becreated. As another example, based on a horizontal or vertical sum ofareas (or count) of circles 492 in FIG. 4C, a histogram 500 of distance(e.g., from one side of the pattern to the opposite side) plottedagainst area (or count) may be created. This data may be useful inidentifying a visual pattern using a quantitative distribution pattern,determining characteristics of a pattern such as the distance ofarea-weighted or count-weighted average 502, or simplifying themachine-observed pattern by encoding into a plot. Quantitative data suchas plot 500 or a tabular format thereof may be further analyzed ortransmitted in a digital format that is more compact than the patternitself, which may comprise images or degraded versions thereof. In someimplementations, the distance may be measured as depth, particularly forpatterns detectable from multiple surfaces (using, e.g., IR, UV) asdescribed supra.

In some implementations, pattern identification may be configured basedon polarization of light. Reflection of incident light at and/or closeto the Brewster angle is strongly polarized even when the incident light(e.g., sunlight) is weakly polarized and/or not polarized at all. Asurface of an object (e.g., 152 in FIG. 1B, 222 in FIG. 2, 312 in FIG.3) may be coated with crystalline material predominantly oriented sothat the reflection towards the detecting device (e.g., along ahorizontal axis) would be polarized. In one or more implementations, anabsorptive and/or a birefringent filter may be used to detect reflectedlight of a given polarization.

An imaging apparatus, (e.g., 150 in FIG. 1B, 202 in FIG. 2, 302 in FIG.3) may employ a filter (e.g., 206 in FIG. 2, 306 in FIG. 3). The filtermay modify intensity of the polarized portion of the light that may havebeen reflected from the pattern surface, relative the light portion thatmay have been reflected from areas outside the pattern surface. Theimaging apparatus may comprise a processing component (e.g., 616 in FIG.6A) configured to determine a difference between intensity (brightness)of pixels in a given image and/or to determine occurrence of a pattern.The pixel intensity variations within the image may be used to detectoccurrence of one or more a predetermined patterns (QR code, barcode,pattern of bars or dots, Mandelbrot and/or other fractal set, and/orother patterns).

In some implementations, pattern identification may be configured basedon a wavelength characteristic. By way of an illustration, a visuallytransparent while UV-absorbent spray (for instance such as used toprotect works of art from UV radiation and/or Trek7 Ray Bloc UV FabricProtector Spray) may be applied onto an object (e.g., a vehicle, agarment, and/or other) via a stencil. Sprayed portions of the patternmay be characterized by higher UV absorption (lower UV reflectance) thanthe unsprayed parts, and thus will look darker to the UV-sensitiveimaging system.

An imaging apparatus, (e.g., 150 in FIG. 1B, 202 in FIG. 2, 302 in FIG.3) may employ a filter (e.g., 206 in FIG. 2, 306 in FIG. 3) configuredto absorb and/or reflect visible portion of the light spectrum whilepassing through near-UV radiation. In some implementations, the filtercutoff wavelength may be selected at wavelength between 300 nm and 400nm (for example a photographic 403 filter). The imaging apparatus maycomprise a detector component (e.g., a CMOS/Active pixel sensor) thatmay be sensitive to a near-UV radiation.

In some implementations, pattern identification may be configured basedon a relative reflectance of the pattern components in the invisiblepart of the spectrum (in the above example—in the near UV).

In some implementations, pattern identification may be configured basedon a comparison of outputs provided by two detectors. In someimplementations, one detector equipped with a filter and the otherwithout a filter. In some implementations, individual detector componentmay comprise respective while different filters. A difference image maybe obtained by subtracting an image obtained by the first detectorcomponent from the image obtained by the second one detector.

FIG. 6A is a functional block diagram illustrating components of acomputerized apparatus 600 configured for use with one or moreimplementations disclosed herein. The apparatus 600 may include one ormore of a learning configuration unit 612, a memory 614, a processingunit 616, a user interface (UI) 618, a sensory unit 620, an electricalunit 622, a power unit 624, a communications unit 626, and/or othercomponents. The learning configuration unit 612 may be configured tofacilitated learning by apparatus 600. The memory 614 may be configuredto store and/or provide access to information associated with apparatus600. The processing unit 616 may provide processing capabilities toapparatus 600. The user interface (UI) 618 may be configured to receiveinformation from a user and/or convey information to a user. The sensoryunit 620 may be configured to sense an environment surrounding apparatus600. The electrical unit 622 may be configured to facilitate locomotionof apparatus 600. The power unit 624 may be configured to provideelectrical power to one or more components of apparatus 600. Thecommunications unit 626 may be configured to facilitate communication ofinformation to and from apparatus 600.

FIG. 6B is a functional block diagram illustrating components of acomputerized imaging system 650 configured to detect humannon-detectible codes via lens 658 of an imaging sensor 652, inaccordance with one or more implementations. In one implementation, theimaging system of FIG. 6B may comprise an active display system (e.g.,LCD) which may render a new code (e.g., on image 662) based on asequence of predetermined images 660 (comprising images 662 through 664)and/or based on a communication protocol 676 that may include messagesfrom a communication module 654 connected to the imaging sensor 652. Insome implementations, the images are configured to be generated andtransmitted to or from at least one CPU 670 (via link 668), which isconfigured to be in communication with a communication module 672. TheCPU may insert or remove or otherwise modify the images 660.

As shown, information associated with the images or patterns 660 (e.g.,662 through 664) may be stored on a remote storage location 658 via path674 and retrieved by the communication module 654 connected to theimaging sensor 652 via path 656. The direct receipt of informationassociated with the patterns or images may also be used (via path 672).For example, in some cases, direct information may be useful as controldata for use in pattern identification or training to identify patternsbased on a comparison of data provided by the communication modules 654,672 and visually detected by the imaging sensor 652. Training of theimaging sensor 652 (or one or more components thereof, such as thelearning configuration unit 612 of FIG. 6A) may be useful in improving,calibrating, or correcting detection sensitivity.

FIG. 7 is a graphical illustration depicting determination of avehicle's 710 relative position by an imaging sensor 700 capable ofdetecting machine detectable code 722 on a surface 724 of vehicle 710,according to one or more implementations. The imaging sensor 700 of FIG.7 may be configured to detect a code 722 on a surface of vehicle 724,and/or capable of extracting the relative position 706 of the imagingsensor with respect to the vehicle. The detected pattern 722 may beembedded in the license plate light or brake lights, and/or on thepainted surface 724 of the vehicle. The pattern 722 may be chosen suchthat the estimate of an aspect of the relative position 706 is bestmeasured (e.g., depth vs. translation), potentially optimized fordifferent distances (e.g., detection at large distances, depthestimation at more proximal distances).

FIG. 8 is a graphical illustration depicting a downward facing imagingapparatus 800 configured to facilitate vehicle navigation, according toone or more implementations. In one implementation, the imagingapparatus 800 comprises a vehicle 802 having a lens 804 attached to animaging sensor 806. The imaging apparatus 800 may be capable ofnavigating roads, terrain, or predetermined paths. A pattern of markingsmay be used to indicate navigational paths 816, 818, waypoints 810, 812,and/or potential actions. Waypoints 810, 812 may exist preceding and/orwithin intersections to facilitate anticipation and execution of turns.Waypoints 810, 812 may comprise markings on the ground or otherlocations (e.g., signs, billboards, buildings) that are visible only tothe imaging sensor 806 to facilitate navigation and/or potential actionsof the vehicle 802. Such markings may also be visible to human viewersand/or may be camouflaged within surrounding unobtrusive markings. Paths818 may be curved so as to facilitate the navigation around obstacles814. Paths on ground may be passively marked and/or actively controlled.

FIG. 9A is a graphical illustration depicting an imaging apparatus 900disposed on a cart 910 and configured to enable cart navigation bytracking an invisible code 922 disposed on a person 920, in accordancewith one or more implementations. The code 922 may comprise a patterndisposed on a belt and/or on the external surface of the clothing,detectable by an imaging sensor 906 associated with the cart 910. Insome implementations, the code pattern 922 may be part of a design onbelt and/or the external surface of the clothing worn by the person 920,such that the code pattern 922 is aesthetically unobtrusive to humanviewers but machine detectable, such as with the imaging apparatus 900.

FIG. 9B is a graphical illustration depicting a system including aceiling-mounted imaging apparatus 930 configured to image an indoorenvironment and detecting a code 942 on a person and/or objects, inaccordance with one or more implementations. The system of FIG. 9B maybe configured to image a person in an indoor environment detecting anycodes on the person, or any objects on their person, or localized theperson by virtue of interrupting the path from an known code behind theperson or below their feet 944, 946. The location of the person may besensed and interrelated between multiple cameras 932, 934, based on thepresence of shared codes 942, 944 and/or 946 present in both cameras atthe same time. These codes may be fixed in the environment or present onthe person or vehicle passing through a scene.

FIG. 10A is a graphical illustration depicting application of anidentification material 1006 onto a plant 1004 for detection by acomputerized imaging apparatus, in accordance with one or moreimplementations.

In one or more implementations, the identification substance 1006 maycomprise a spray configured to coat surface of the plant. Theidentification material may be detectable in an invisible part ofelectromagnetic spectrum (e.g., IR, UV). In one or more implementations,the substance may be taken up (via, e.g., absorption) by the plant. Thesubstance uptake by the plant may modify absorption light spectra of theplant and/or portions thereof (e.g., leaves). The absorption spectramodification may be configured to be selective for some plants but notothers, outside the human spectral visual range. Modification of oneplant (e.g., 1004) but not others (e.g., plant 1002) will result inmachine-identifiable difference inherent in the modified plant, asdescribed infra.

In one or more implementations, the substance uptake may modify thegenetic makeup and/or protein expression of the plant or fungus therebyaffecting the absorption spectra of the plant.

FIG. 10B is a graphical illustration depicting appearance to a humanobserver of an unmarked plant 1002 and a plant 1024 to be marked with aninvisible substance applied thereon. In visible portions ofelectromagnetic spectrum, both the marked and the unmarked plants mayappear indistinguishable (based on properties of reflected light) fromone another to the human observer.

FIG. 10C is an image illustrating detection of a plant 1024 marked withan invisible identification substance 1006 as viewed by a computerizedimaging apparatus. In some implementations, the identification substancemay be detected in IR or UV portions of the spectrum. Plants 1002, 1024that were previously indistinguishable by human observer are shown to bedistinguishable by a machine observer.

FIG. 11 is a logical flow diagram illustrating a method 1100 of usinginvisible coding for triggering an action based on identification of thecode, in accordance with one or more implementations. At operation 1102,a special pattern may be applied (by one or more of the approachesdescribed herein) to an object. The pattern may be inconspicuous orinvisible to a human eye, but may be sensed (“seen”) by a robot cameraor other special sensing device. At operation 1104, the robot may sensethe pattern using invisible parts of the electromagnetic spectrum, lightpolarization, color metamerism, and/or other approaches describedherein. The pattern may include a marker (e.g., special symbol orsymbols, arrangement, data, absorption pattern, QR code, and/or othermarkers) that is read or identified at operation 1106 by the robotcamera or the special sensing device, and at operation 1108, causes therobot to carry out an appropriate action and/or provides the robot withpertinent information. The process may be repeated as necessary. Forexample, the apparent distance between pattern elements may provide therobot with data about the distance and angle to the pattern as the robotapproaches and/or manipulates the object.

FIG. 12 is a logical flow diagram illustrating a method 1200 of patternadjustment for use with the computer detectable pattern methodology, inaccordance with one or more implementations. At operation 1201, apattern may be generated dynamically (e.g., by means of a CRT, LCD,and/or other means) on an object. The pattern may be inconspicuous orinvisible to a human eye, but may be sensed (“seen”) by a robot cameraor other special sensing device. For example, at operation 1202, thepattern may be sensed using invisible parts of the electromagneticspectrum, light polarization, color metamerism, and/or other approachesdescribed herein. The pattern may contain a marker (e.g., special symbolor symbols, arrangement, data, absorption pattern, QR code, and/or othermarker) that is read or identified by the robot camera or the specialsensing device, and causes the robot at operation 1204 to carry out anappropriate action and/or provides the robot with pertinent information.At operation 1206, the robot may then establish a unidirectional orbidirectional communication link with the object (e.g., using the sameinconspicuous-pattern method, and/or a conventional link such as WiFiand/or other communications techniques) and inform the object that thepattern has been successfully read. The process may be repeated asnecessary. For example, at operation 1208, the object may update thepattern and/or compute a new pattern (e.g., represent the nextinformation packet) in response to being informed that the presentpattern has been successfully read by the robot.

FIG. 13 illustrates a method 1300 of detecting a pattern in an image foruse with the computer detectable pattern methodology in accordance withone or more implementations.

At operation 1302 of method 1300, a region, may be detected in an image,e.g., the region 1510 in the image 1500 of FIG. 15. In one or moreimplementations, the region may comprise a visible pattern, e.g., acompany logo on a garment, a patch of color (e.g., background), and/oroutline of a car (e.g., rear-view of a car trunk 724 comprising thepattern 722 in FIG. 7).

At operation 1304, one or more reference locations may be identified. Insome implementations (e.g., such as illustrated in FIG. 15), thereference locations may comprise three non-collinear points (e.g., thepoints A, B, E 1522, 1524, 1526 in FIG. 15) also referred to as the keypoints comprising a portion of the pattern (e.g., 1520) beingidentified. In one or more implementation, the reference locations maycomprise locations with a known configuration (e.g., corner locations ofthe area 314 in FIG. 3). A pattern coordinate frame may be determinedbased on the reference locations selected at operation 1304.

At operation 1306 pixel intensity may be evaluated within the region. Insome implementations, the intensity evaluation may comprisedetermination of an intensity level (threshold) that may be used todistinguish the code portion (e.g., hashed polygon 1520 in FIG. 15 fromthe background portion (e.g., white background within the rectangle 1510in FIG. 15). The code portion may correspond to an intensity level(tone) that may be detected by the computerized imaging apparatus (e.g.,the apparatus 200 in FIG. 2 and/or 652 in FIG. 6). In someimplementations, the code portion may comprise the invisible markings,filling potentially homogenous bounded forms, on a machinedistinguishable background, e.g., the portion 1520 on the background1510 in FIG. 15.

At operation 1308 pattern characteristic may be determined. In someimplementations, the pattern characteristic may comprise one or morecontrast inversion boundary (e.g., segment GH 1524 in FIG. 15), one ormore corner points (e.g., the point denoted with capital letters A, B,C, D, E, F, G, H, J in FIG. 15), aspect ratio, and/or other parameters.

At operation 1310 the pattern characteristic may be transformed(registered) to a reference coordinate frame. In some implementations,the reference frame may be selected as, fronto-parallel with respect tothe plane of the pattern. By way of an illustration, a fronto-parallelplane may comprise a plane perpendicular to an the axis normal to theplane of the pattern (e.g., the axis denoted by arrow 154 in FIG. 1Bthat may be perpendicular to the plane 160). The coordinate planetransformation may be configured based on a known configuration (e.g.,distances in x-y), between the reference locations (e.g., 1522, 1524,1526 in FIG. 15) with respect to one another in the pattern plane andthe configuration for these locations determined from the image (e.g.,at operation 1304). In one or more implementations, the transformationmay comprise a translation and/or rotation in 2D or 3D space of one ormore of the contrast inversion boundaries and/or one or more cornerpoints.

At operation 1312, a similarity measure may be determined. In one ormore implementations, the similarity map may comprise a comparison ofthe transformed pattern parameters to a template, a hash (e.g.,perimeter, area, median distance, e.g., 502 in FIG. 5, distancevariance), and/or other operations configured to enable acomputationally efficient determination as to whether an observedpattern corresponds to a known pattern (code).

FIG. 14A is a graphical illustration depicting application of anexpression agent 1406 to a living plant 1404 to enable subsequentidentification by a computerized imaging apparatus in accordance withone or more implementations.

The expression agent 1406 may be applied via watering or other form oftargeted application method to one or more select plants. In one or moreimplementations, the expression agent may comprise a substance that maybe taken up (absorbed) by the plant via leaves and/or roots. Thesubstance uptake by the plant may modify absorption light spectra of theplant and/or portions thereof (e.g., leaves), as illustrated by theplant 1414 in FIG. 14B. The absorption spectra modification outside thehuman spectral visual range may be configured for some selected plants(e.g., 1404) but not the other 1402.

In one or more implementations, the substance uptake may modify thegenetic makeup and/or protein expression of the plant or fungus therebyaffecting the absorption spectra of the plant (e.g., the plant 1414).

FIG. 14C illustrates appearance to a human observer of an unmarked plant1422 and a plant 1424 marked with the expression agent. In visibleportion of electromagnetic spectrum, both the marked 1424 and theunmarked plants 1422 may appear indistinguishable (based on propertiesof reflected light) from one another

FIG. 14D illustrates detection by a computerized imaging apparatus of aplant 1424 marked with the expression agent identification. Marked plant1424 is clearly identifiable and distinguishable from unmarked plant1422 from the viewpoint of the imaging apparatus, enabling the imagingapparatus or another entity (e.g., human viewer, other apparatus) tocarry out an action based on the identification (e.g., operations 1108,1204, 1208). In some implementations, the identification substance maybe detected in IR or UV portions of the spectrum.

It will be recognized that while certain aspects of the disclosure aredescribed in terms of a specific sequence of steps of a method, thesedescriptions are only illustrative of the broader methods of theinvention, and may be modified as required by the particularapplication. Certain steps may be rendered unnecessary or optional undercertain circumstances. Additionally, certain steps or functionality maybe added to the disclosed implementations, or the order of performanceof two or more steps permuted. All such variations are considered to beencompassed within the disclosure disclosed and claimed herein.

While the above detailed description has shown, described, and pointedout novel features of the disclosure as applied to variousimplementations, it will be understood that various omissions,substitutions, and changes in the form and details of the device orprocess illustrated may be made by those skilled in the art withoutdeparting from the disclosure. The foregoing description is of the bestmode presently contemplated of carrying out the invention. Thisdescription is in no way meant to be limiting, but rather should betaken as illustrative of the general principles of the invention. Thescope of the disclosure should be determined with reference to theclaims.

What is claimed is:
 1. A method of detecting an object by a computerizedimaging apparatus, the method comprising: observing an object, whereinthe object comprises a pattern; sensing at least a portion of thepattern on the object; and identifying the object based on the sensed atleast portion of the pattern; wherein the pattern comprises at least oneof a patch of color or at least one medium that is undetectable viawavelengths that are visible to a human eye but detectable by thecomputerized imaging apparatus, wherein the pattern comprises the atleast one medium, and sensing the pattern comprises sensing a firstmedium that is absorbent at a given wavelength range outside a givenhuman-visible spectral range, and a second medium that is less absorbentin the given spectral range relative to the first medium, and whereinthe first medium and the second medium comprise fiber threads woven intoa textile of the object.
 2. The method of claim 1, wherein the firstmedium and the second medium comprise material that was printed onto theobject by a 3-D printing process.
 3. The method of claim 1, wherein thesensing the pattern on the object comprises sensing a given wavelengthrange that comprises an infrared or an ultraviolet portion.
 4. Themethod of claim 1, wherein sensing the pattern comprises sensing aspectrum of metameric coloration.
 5. The method of claim 1, whereinsensing the pattern comprises sensing a polarized composition ofreflected light.
 6. The method of claim 5, wherein responsive to anelectro-optical device changing a composition of the polarizedcomposition of reflected light, identifying the changed composition ofthe polarized reflected light.
 7. The method of claim 1, wherein thepattern comprises the patch of color.
 8. The method of claim 7, whereinthe object is a garment.
 9. The method of claim 8, further comprisingtracking the object to maintain a range of a robotic apparatus to thegarment, wherein the robotic apparatus is a vehicle.
 10. A method oftracking a person by a robotic apparatus, the method comprising:acquiring a representation of the person at a distance; identifying acharacteristic of a pattern disposed on the representation of theperson; and adjusting a trajectory of the apparatus so as to maintain arange to the person within a target range; wherein: the acquiring therepresentation comprises detecting a signal at a wavelength invisible toa human; and the pattern comprises one or more elements that areconfigured to reflect the signal at the wavelength, wherein the signalcomprises light reflected from a garment of the person.
 11. The methodof claim 10, wherein the signal comprises light generated from a specialilluminant.
 12. The method of claim 10, wherein the identifying thecharacteristic comprises identifying one or more geometric shapes of thepattern.
 13. A method of tracking a person by a robotic apparatus, themethod comprising: acquiring a representation of the person at adistance; identifying a characteristic of a patch of color disposed onthe representation of the person, wherein the acquiring therepresentation comprises detecting the patch of color; and adjusting atrajectory of the apparatus so as to maintain a range to the personwithin a target range, wherein the patch of color comprises lightreflected from a garment of the person.
 14. The method of claim 13,wherein the identifying the characteristic comprises identifying awavelength characteristic.
 15. The method of claim 14, wherein the patchof color forms a pattern.
 16. The method of claim 13, wherein theidentifying the characteristic comprises identifying one or moregeometric characteristics of the patch of color.